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AlienVault OTX General

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AlienVault OTX Vulnerabilities

AlienVault OTX Malware

A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create the new variable, it tries to print an error message to the user; however, the number of parameters used by the logging function doesn't match the format string used by it, leading to a crash under certain circumstances.

CVE-2023-40546 identifies a NULL pointer dereference vulnerability in the Shim component of Red Hat Enterprise Linux 7. Shim is a key part of the secure boot process, acting as a first-stage bootloader that verifies signatures before loading the OS. The flaw occurs when Shim attempts to create a new ESL (EFI Signature List) variable and fails; during error reporting, the logging function is called with a mismatched number of parameters relative to its format string. This mismatch causes a crash of the Shim process under certain error conditions. The vulnerability does not require privileges or user interaction but does require local access to trigger. The impact is a denial of service due to the crash, potentially disrupting the boot process or secure boot verification, which could prevent systems from starting correctly or cause instability. There is no impact on confidentiality or integrity, and no known exploits have been reported. The CVSS score of 6.2 (medium) reflects the local attack vector, low complexity, no privileges required, and a high impact on availability. The vulnerability is specific to Red Hat Enterprise Linux 7, which remains widely used in enterprise environments, particularly in Europe. No patches or exploit code are currently publicly available, but Red Hat is expected to release updates to address the issue. Organizations relying on secure boot with Shim should prioritize reviewing their bootloader configurations and prepare to apply patches promptly.

Detailed information about CVE-2023-40546: NULL Pointer Dereference in Red Hat Red Hat Enterprise Linux 7 affecting Red Hat Red Hat Enterprise Linux 7. Get real

CVE-2023-40546: NULL Pointer Dereference in Red Hat Red Hat Enterprise Linux 7 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-40546: NULL Pointer Dereference in Red Hat Red Hat Enterprise Linux 7

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